msort: add usage

8 years ago · 2682ebf110
parent 905851a851
commit 2682ebf110
1 changed files with 2 additions and 1 deletions
--- a/msort.c
+++ b/msort.c
@ -277,7 +277,8 @@ main(int argc, char *argv[])
 		case 'S': addorder(sizeorder); break;
 		case 'r': rflag = !rflag; break;
 		default:
-			// XXX usage
+			fprintf(stderr,
+			    "Usage: msort [-r] [-fdsFMS] [msgs...]\n");
 			exit(1);
 		}